What Mechanism Is Proposed for Cretaceous Subsidence of the Canadian

question 77

Multiple Choice

What mechanism is proposed for Cretaceous subsidence of the Canadian and American prairies?

• A)An underlying mantle plume suddenly quit, cooled, and subsided.
• B)A subducting slab detaches from the trailing lithosphere, creating a downward flow that drags the base of the overriding continent with it.
• C)A former broad monocline under the prairies eventually flattened out.
• D)A large Cretaceous meteorite impacted the prairies, the evidence for which has yet to be found.

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